Smile Boxer

Kang Chan dreams of becoming a boxer in a rural village! To repay the elders who raised him, he trains every day without fail. Then one day, men in black invade the village for redevelopment. They threaten the villagers, and Kang Chan steps forward, but he finds it impossible to face such a large crowd. As he sobs, berating himself for failing to protect the villagers, a person appears who will change Kang Chan's fate.

(Source: Naver, translated)